SU1733650A1 - Method for operation of free-piston diesel-electric-generator - Google Patents

Abstract

SUMMARY OF THE INVENTION: In a free-piston diesel-electric generator, the duty cycle is performed at a compression ratio of 30-35 and the gases are cooled by injecting water into the cylinder to a temperature of 100–200 ° C at the exhaust. Due to this, it is possible to reject the external diesel cooling system and increase its efficiency. 1 il.

Description

FIELD OF THE INVENTION The invention relates to engine-making, in particular, to a method for operating a free piston diesel-electric generator.

A known method of operation of a free-piston diesel-electric generator includes compression of air in a cylinder of a diesel engine, supply and combustion of a portion of fuel in it, and conversion of energy of gases expanding in a cylinder into electrical energy in a linear electric generator.

However, the existing method of operating a free piston diesel generator set is not very effective due to the presence of an inefficient transverse blowdown, as well as a cooling jacket installed between the cylinder, the field windings and the stator winding, which increases the gap between these windings, which leads to large scattering magnetic flux generator. Another disadvantage of the existing method of operating a diesel electric generator is the removal of heat when cooling its cylinder to the environment, which reduces its efficiency.

The aim of the invention is to increase the efficiency of a free piston diesel-electric generator.

This goal is achieved in that a portion of cooling water is supplied to the cylinder of diesel at the maximum gas temperature in an amount that ensures the exhaust gas temperature is 100-120 ° C with the degree of air compression in the cylinder equal to 30-35.

The drawing shows a diagram of the free- and piston diesel-electric generator.

Diesel-electric generator works as follows.

In the cylinder 1 of the diesel engine, when the piston of the rotor 2 is in its extreme position, air is compressed and the fuel nozzle 3 injects fuel into it (the exhaust valve 4 is closed at this time). Further, in the upper cavity of the cylinder, a combustion-expansion process takes place and the piston-rotor 2 begins to move from the extreme upper position to the extreme lower position. When the burning temperature reaches its maximum value in the cylinder 1, a water nozzle 5 is supplied with a portion of cooling water, which, intensively evaporates, cools the cylinder 1 and increases the expansion pressure.

Further, when the piston of the rotor 2 moves downward, the exhaust valve 4 and the purge port of the upper cavity

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the cylinder 1 is used to release the exhaust gas-vapor mixture and purge it with compressed air. Then, the piston-rotor 2, when moving downward, compresses the air in the lower cavity of the cylinder 1. When the piston-rotor 2 approaches, the extreme lower position of the fuel injector 7 injects fuel into the cylinder 1. Then, in the lower cavity of the cylinder 1, a combustion-expansion process takes place (the exhaust valve 8 is closed at this time) and the piston-rotor 2 begins to move from the lowest position to the extreme high position. When the burning temperature reaches the maximum value in the lower cavity of the cylinder 1, a water nozzle 9 is supplied with a portion of cooling water that evaporates intensively, cools the cylinder 1 and increases the expansion pressure.

When the piston of the rotor 2 moves upward, the exhaust valve 8 and the purge port 6 are opened. In the lower cavity of the cylinder 1, the exhaust gas-steam mixture is released and purged with compressed air. Then the process is repeated again.

During the reciprocating movement of the piston of the rotor 2 in the cylinder 1 in the power windings 10 of the electric generator, an electromotive force is induced under the action of the excitation winding 11, the excitation winding 11 and

other power generator control functions.

The amount of cooling water in the cylinder is supplied by water injectors so as to provide an exhaust gas temperature of 100-120 ° C. At the same time, the degree of air compression in the cylinder is provided in the range of 30-35.

Using the proposed method of operating a free piston diesel-electric generator allows one to increase the efficiency of its operation in comparison with the existing diesel-electric generator by means of a higher-quality longitudinal valve-slit diesel cylinder sweep, reducing the gap between the stator and rotor windings, as well as using internal cooling instead of external cooling.

Claims (1)

Invention Formula The method of operation of a free piston diesel generator, including compression of air in a diesel cylinder, supply and combustion of a portion of fuel in it, and energy conversion of gases expanding in a cylinder into electrical energy in a linear generator, characterized in that, in order to increase efficiency, The maximum temperature of the gases is supplied by a portion of cooling water in an amount that provides an exhaust gas temperature of 100-120 ° C with a degree of air compression in the cylinder of 30-35. V boz U gene. 12